Device for draw-forming metal rods

ABSTRACT

A device for drawing a metal rod, particularly, a cast steel rod comprises one or more deforming rollers which are arranged to engage the rod on opposite sides thereof as it is moved thereby. The rollers are moved by a mechanism to provide for the desired drawing down from a wide diameter down to a relatively small diameter. The mechanism includes a pivotal support member which carries a deforming roll and which is moved by a first rotating crank into pressure force engagement with the rod being cast as the rod is moved thereby. The mechanism also includes an additional second crank mechanism for engagement with the support for shifting the support in a substantially longitudinal direction in respect to the rod being formed. In a first embodiment the second crank for controlling the longitudinal direction of movement of the support engages the support by means of a pushrod having a pin which is guided in a slot defined in the direction of the longitudinal axis of the support member and which is also guided by a sliding block. In another embodiment the engagement of the second crank with the support is a direct engagement. The drive for the crank includes a gear which drives through an idler gear to the crank for moving the support member in a direction toward and away from the rod being cast. An alternate embodiment includes a direct gear drive from the first crank to a gear carrying the shaft for the second crank.

United States Patent [72] lnve ntors Hans Weber Duisburg; JoachimMietzner, Angermund, Germany [21 Appl. No. 783,998 [22] Filed Dec. 16,1968 [45] Patented Apr. 13, 1971 [73] Assignee Demag AktiengesellschattDuisburg, Gennany [32] Priority Dec. 29, 1967 i 3 Germany [31] P 16 02062.5

[54] DEVICE FOR DRAW-FORMING METAL RODS 7 Claims, 3 Drawing Figs.

[52] US. Cl 72/240, 72/406, 72/408 [51] Int. Cl B21b 1/42 [50] Field ofSearch 72/184, 189,190, 191,240, 406, 408

[56] References Cited,

UNITED STATES PATENTS 995,427 6/1911 lnshaw et al. 72/240 PrimaryExaminer-Lowell A. Larson Attorney-McGlew and Toren ABSTRACT: A devicefor drawing a metal rod, particularly, a cast steel rod comprises one ormore deforming rollers which are arranged to engage the rod on oppositesides thereof as it is moved thereby. The rollers are moved by amechanism to provide for the desired drawing down from a wide diameterdown to a relatively small diameter. The mechanism includes a pivotalsupport member which carries a deforming roll and which is moved by afirst rotating crank into pressure force engagement with the rod beingcast as the rod is moved thereby. The mechanism also includes anadditional second crank mechanism for engagement with the support forshifting the support in a substantially longitudinal direction inrespect to the rod being formed. In a first embodiment the second crankfor controlling the longitudinal direction of movement of the supportengages the support by means of a pushrod having a. pin which is guidedin a slot defined in the direction of the longitudinal axis of thesupport member and which is also guided by a sliding block. In anotherembodiment the engagement of the second crank with the support is adirect engagement. The drive for the crank includes a gear which drivesthrough an idler gear to the crank for moving the support member in adirection toward and away from the rod being cast. An alternateembodiment includes a direct gear drive from the first crank to a gearcarrying the shaft for the second crank.

Patented; April 13, 1971 v 3,575,029

3 Sheets-Sheet 1 Inventors HANS WEBER J'JACH/M M/El'Zl/EZ ATTOQA/EY;

Patented April13, 1971 3,575,029

3 Sheets-Sheet 2 Inventors HANS WEBER JOACH/M M/EfZ/VEQ A TTOBNEVSPatentd A ril13, 1971 3,575,029

3 Sheets-Sheet 13 Inventors mws wsasz JDAC/l/M m/srzz/za A TTOQNEYSsupporting member through a construction also permits a very compactmachine DEVICE FOR DRAW-FORMING METAL RODS SUMMARY OF THE lNVENTlON Thisinvention relates in general to metal forming devices and in particular,to a new and useful device for drawing down a metal rod, particularly, acast steel rod, which includes separate rotatable drive cranks connectedto an oscillating support member carrying a deforming roller to controlthe movement of the member to guide the deforming roller into formingengagement with the rod as it is moved thereby.

An important requirement for the forming of a metal rod to draw it downto a relatively small diameter requires that there be a high reductionof the cross section of the rod with each pass. It is particularlydesirable to achieve a great reduction of the cross section when drawinghot rods such as they would be obtained from a continuous casting plantwithout any additional heating. A mechanism for controlling thepositioning of deformation rollers which operate on the rod is providedin accordance with the invention and it is an improvement over the priorart particularly in respect to the fact that it permits the manufactureof the rods of different dimensions when operating upon a workpiecehaving an optimum casting cross section. The changing of a rod crosssection can be effected during the operation by forming only a smalllength of the rod during each pass to provide the desired transition.The resulting deformation forces are very great, however, in view of thebloom cross section which must be processed so that the forming forcesare comparable to those of a conventional rolling stand.

in order to avoid premature wear of the device but to ensure a goodabsorption of the forces it is suggested that the forming rollers becarried on a support member. This support member is mounted so that itmay be oscillated backwardly and forwardly and it is guided by twoseparate rotating crank elements which are either directly connectedthereto or connected to the support member through a pushrod and anassociated pin and slot connection. The two separate crank membersoperate to provide a separate drive for the deformation roller inrespect to longitudinal and radial movement directions and may providefor example, separate drives for affecting the deformation of the rodand for absorbing the deformation forces. A particularly favorableembodiment is obtained by arranging a lower crank rod which isarticulated by a shaft mounted on one side of the apparatus to oscillatea pushrod member which is confined for movement on a sliding blocklocated above the rod being deformed. The pushrod is in turn connectedthrough a pin into a slot of the support member carrying the deformationroller. The sliding block guide ensures an exact application of thedeformation roll on the workpiece and permits an exact forming of therod down to its reduced dimension at the location of the deformationzone.

According to another feature of the invention the oscillating supportmember and the crank member for transmitting the pressure force to thedeformation roller carried by the support member are combined in asingle part. This permits the construction of a very compact machinerequiring very little space and this is particularly important where aplurality of rods are to be operated in several drawing down operationalfeedlines which are arranged close together.

Another simplification of a construction is an arrangement in which thepivotal support member is driven by a crank having a pin which is guidedin a straight recess or slot of the supporting member. With such aconstruction the oscillatable movement of the roll support is carriedout by the pin and guide arrangement but the pressure forces are appliedto the separate drive. This construction. It is advantageous to make thedrive for both movements of the support member synchronous.

The oscillating drive and the pressure force supplying drive to thedeformation rollers carried by the support member better advantageouslyis carried out through a plurality of meshing gears with the crankdrives being carried on a shaft carrying an associated one of the gears.Synchronization of one crank rod movement with the other is carried outeither through a direct gear driving or by the use of an intermediategear or idler. The upper end of the support rod is advantageouslycarried by one of the crank members and is permitted to pivot so as tooscillate the roller carried at its opposite lower end. The other crankdrive is connected to the support member at a location intermediate thelength thereof and is moved to cause the oscillation of the supportmember.

Accordingly, it is an object of the invention to provide a device fordrawing down a metal rod which includes one or more oscillatablesupporting members which carries a deformation roller which isengageable with a rod workpiece as the rod is moved thereby in a pass,and which also includes a first crank connected to the support memberfor applying a deformation force against the rod and a second crankconnected to the supporting member to affect the oscillation thereof.

A further object of the invention is to provide a device for deforming ametal rod particularly a cast rod which includes first and second crankmembers for controlling the movement of the support member carrying adeformation roller which is operable on the rod, the crank members beingdriven from a gear transmission to coordinate their movement and toaffect the separate oscillatory drive of the support member for thedeformation roller and its separate pressure drive movement.

A further object of the invention is to provide a device for forming ametal rod which is simple in design, rugged in construction, andeconomical to manufacture.

The various features of novelty which characterize the invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a understanding of the invention, itsoperating advantages and specific objects attained by its use, referenceshould be had to the accompanying drawings and descriptive matter inwhich there are illustrated and described preferred embodiments of theinvention.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

HO. 1 is a schematic side elevational view of a device for drawing acast rod constructed in accordance with the invention;

HO. 2 is a view similar to FIG. 1 of another embodiment of theinvention; and

FIG. 3 is a view similar to FIG. embodiment of the invention.

GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to thedrawings in particular, the invention embodied therein in FIG. 1comprises a rod drawing apparatus for operating on a casting rod 1 whichis fed to the device of the invention at a rate of from 3 to 4 metersper minute. The rod during each pass is reduced at the location 3 from across section comparable to that indicated at 2 to a cross section atthe end indicated at 4. For this purpose working rolls or deformationrollers 5 are mounted on a support or oscillatable member 6 which ispivotal on a pivot 7 formed at the end of first crank means in the formof a crank arm 40 which is carried on a shaft 42. The support 6 receivesits oscillatable drive in accordance with the invention by second crankmeans in the form of a drive mechanism which includes a pushrod 8 whichis pivoted at pivot 9 on a crank member 44 carried on a shaft 46.Connecting means are provided between the member 6 and the second crankmeans which, in addition to the pushrod 8, includes a pin 22 at theouter end of the pushrod which is confined for movement within a slot 25and which extends along parallel to the longitudinal axis of the support6. The .pin 22 also carries a block 21 which is confined 1 of stillanother for movement along an oblique path defined between two slidingsurfaces 23 and 24.

in accordance with a further feature of the invention the support 6 forthe deformation roller is also driven in a pressure direction, that is,in a direction substantially radial to the rod or workpiece 4 by a crankmember 40. Synchronism of the cranks 40 and 44 is carried out by aninterconnecting gearing between shafts 42 and 46 which includes thedrive gear on shaft 46, an idler gear 16 and a driven gear 11' on theshaft 42. The operation of the mechanism produces a movement of adeformation roller 5 such that its center passes through the curve 50indicated in H0. 1. A similar deformation roller 5 is arranged on theopposite side or underside of the rod 4 and the device is operated sothat the deformation rollers 5,5 move to engage the rod uniformly fromopposite sides. Similar sets of deformation rollers 5,5 may be employedaround the rod at distinct planes.

In the embodiment indicated in FIG. 2, a similar supporting member oroscillating member 6' is provided which is pivotally supported at 7' ona crank member 40' carried on the shaft 42'. In this embodiment a pin 22is carried directly on a crank 44' which is affixed to shaft 46'. Inaddition, the gear 10 drives through an idler 16' to the gear 11'carried on the shaft 42'. Thus the construction does not require thepushrod 8 of FIG. 1 but a similar curve of movement 18 of the center ofthe deformation rollers 5 is produced.

ln the embodiment indicated in FIG. 3, a support or oscillating member6" is pivotally supported on at a pivot 7 of a crank member 40" which iscarried on a shaft 42". The oscillatable movement of the support member6" is effected by a crank 44" carried on a shaft 46 which pivotallyconnects a pushrod 8" at a pivot pin 9". The pushrod 8" is pivoted tothe support member 6" at the location of a pivot 54. In thisconstruction a drive gear 10" on the shaft 46" drives the driven gear 11on the shaft 42" directly. This embodiment provides a synchronous driveof the oscillating movement and the screwdown or pressure movement. Theapparatus of FIG. 3 is particularly suitable for transmitting greatforces with a suitable curve of operation 18'.

We claim:

I. A device for the drawing of a continuous metal casting rodparticularly a steel casting comprising, a support member, a deformationroller carried at one end of said support member adapted to engage aworkpiece rod for forming the rod, first crank means connected to saidsupport member adjacent one end thereof for pivotally supporting saidmember for oscillation and for driving said member in a pressure forcedirection against said rod, second crank means connected to said supportmember intermediate its length for oscillating said support member, andconnecting means between said second crank means and said support memberdefining an articulated joint shiftable in directions parallel to theaxis of said support member during oscillation thereof.

2. A d vice, according to claim 1, including transmission meansconnected between first crank means and said second crank means foroperating said first and second crank means in synchronism.

3. A device, according to claim 1, wherein said first crank meanscomprises a rotatable crank member connected to said support said secondcrank means comprising a rotatable crank member and a pushrod memberpivoted to said crank member and connected to said support.

4, A device, according to claim 3, wherein said connecting meansincludes a pin on said pushrod member, said support having a slotdefined therein extending along its longitudinal axis, said pin beingconfined for movement in said slot.

5. A device, according to claim 4, including a block connected to saidpin, and means confining said block for movement along an oblique pathalongside the workpiece being formed.

6. A device, according to claim 1, including means for synchronizing thespeed of rotation of said first crank means to said second crank meanscomprising a. drivin gear connected to said second crank means and r0table therewith, a driven gear connected to said second crank means androtatable therewith, and an intermediate gear between said driving anddriven gear for driving said driven gear in timed relation to saiddriving gear.

7. A device, according to claim 1, including means for synchronizing thespeed of rotation of said first crank means to said second crank meanscomprising a driving gear connected to said second crank means androtatable therewith, and a driven gear connected to said second crankmeans and rotatable therewith, said driving gear directly engaging saiddriven gear.

1. A device for the drawing of a continuous metal casting rodparticularly a steel casting comprising, a support member, a deformationroller carried at one end of said support member adapted to engage aworkpiece rod for forming the rod, first crank means connected to saidsupport member adjacent one end thereof for pivotally supporting saidmember for oscillation and for driving said member in a pressure forcedirection against said rod, second crank means connected to said supportmember intermediate its length for oscillating said support member, andconnecting means between said second crank means and said support memberdefining an articulated joint shiftable in directions parallel to theaxis of said support member during oscillation thereof.
 2. A device,according to claim 1, including transmission means connected betweenfirst crank means and said second crank means for operating said firstand second crank means in synchronism.
 3. A device, according to claim1, wherein said first crank means comprises a rotatable crank memberconnected to said support said second crank means comprising a rotatablecrank member and a pushrod member pivoted to said crank member andconnected to said support.
 4. A device, according to claim 3, whereinsaid connecting means includes a pin on said pushrod member, saidsupport having a slot defined therein extending along its longitudinalaxis, said pin being confined for movement in said slot.
 5. A device,according to claim 4, including a block connected to said pin, and meansconfining said block for movement along an oblique path alongside theworkpiece being formed.
 6. A device, according to claim 1, includingmeans for synchronizing the speed of rotation of said first crank meansto said second crank means comprising a driving gear connected to saidsecond crank means and rotatable therewith, a driven gear connected tosaid second crank means and rotatable therewith, and an intermediategear between said driving and driven gear for driving said driven gearin timed relation to said driving gear.
 7. A device, according to claim1, including means for synchronizing the speed of rotation of said firstcrank means to said second crank means comprising a driving gearconnected to said second crank means and rotatable therewith, and adriven gear connected to said second crank means and rotatabletherewith, said driving gear directly engaging said driven gear.